Could cyber war cause a "real" war?

http://www.reuters.com/article/2011/06/01/us-usa-cyber-pentagon-idUSTRE74U75420110601

QUOTE: "The United States is warning that a cyber attack -- presumably if it is devastating enough -- could result in real-world military retaliation. In the wake of a significant new hacking attempt against Lockheed Martin Corp, experts say it could be extremely difficult to know fast enough with any certainty where an attack came from. Sophisticated hackers can mask their tracks and make it look like a cyber strike came from somewhere else." 
Scary stuff.